3/16 4 flute , M42 Square Double End, Center Cut, 3/16 Shank, 1 LOC x 3-3/8 OAL
3/16 4 flute , M42 Square Double End, Center Cut, 3/16 Shank, 9/32 LOC x 2 OAL
3/16 4 flute , M42 Square Double End, Center Cut, 3/8 Shank, 1/2 LOC x 3-1/4 OAL